High sunspot activity is celebrated by members of the amateur radio community as a harbinger of excellent ionospheric propagation conditions that greatly increase radio range in the HF bands.

Mar 10, 2025 · This video, captured by NASA’s Solar Dynamics Observatory between July 5 to 11, 2017, shows a sunspot moving across the Sun. Like freckles on the face of the Sun, sunspots …

Jan 2, 2026 · The observed and predicted Solar Cycle is depicted in Sunspot Number in the top graph and F10.7cm Radio Flux in the bottom graph. The predicted progression for the current solar cycle …

On this page you'll find an overview of all the visible sunspot regions on the Sun together with their properties, images and the chances on solar flares or proton events.

Apr 13, 2023 · According to the University Corporation for Atmospheric Research (UCAR), if you could cut out a standard sunspot from the sun and place it in the night sky, it would appear as bright as a full...

Oct 4, 2023 · A sunspot then forms where the magnetic field becomes concentrated and tangled in a specific area and breaks through the surface of the Sun. These aren’t minor disturbances, either.

Dec 3, 2025 · Sunspot, vortex of gas on the surface of the Sun associated with strong local magnetic activity. Spots look dark only by contrast with the surrounding photosphere, which is several …

If you could cut an average sunspot out of the Sun and place it elsewhere in the night sky, it would be about as bright as the full Moon. Sunspots have a lighter, outer section called the penumbra and a …

Times of maximum sunspot activity are associated with a very slight increase in the energy output from the sun. Ultraviolet radiation increases dramatically during high sunspot activity, which can have a …

2 days ago · Sunspot AR3088 put on a striking display of solar activity, unleashing multiple M-class flares as it rotated across and out of view of NASA’s Solar Dynamics Observatory (SDO). This time …